need help with this question please :(

c) If the delivery time is 3 weeks, what should be your reorder point? d) Determine the annual rotation according to the quantity to order in subsection a). Toys International has several manufacturing and assembly plants. One of the manufacturing plants has to supply 640 toy tires a day to the assembly plant. No shortages are allowed to ensure the continuity of the assembly process. The plant has a capacity of 4,200 tires a day. The production setup cost is $ 400 and the storage cost is $ 0.30 per unit per day, while the production cost is $ 92 per tire. a) What is the optimal quantity to produce? || b) Evaluate T, TP and IMAX c) What is the minimum annual average cost? d) How many production runs are made in a year